How can an application developer create a better app using APIs?

Application developers can create enhanced value by composing applications that leverage multiple APIs. This approach, often called a "mashup," combines data and functionality from different services to create a new, more powerful application. By integrating various APIs, developers can rapidly build feature-rich solutions without having to develop every component from scratch, leading to faster innovation and a better end-user experience. This is a core principle of the API economy.

B. A long and arduous on-boarding process is a deterrent to using APIs and indicates a poor developer experience, not a method for creating a better app.
C. Arbitrarily using as few APIs as possible limits an application's potential functionality and the value it can deliver by integrating diverse services.
D. Internal APIs access internal data, not third-party data. To get data from a third-party, an external API provided by that company would be used.

1. IBM API Connect Documentation, "API Connect overview". This section discusses how API Connect helps create, manage, and socialize APIs, enabling the creation of new digital applications. It emphasizes the value derived from exposing and consuming APIs to build new services. (IBM Knowledge Center for API Connect v10).

2. IBM API Connect Documentation, "Tutorial: Importing an existing OpenAPI 2.0 service". The tutorials often demonstrate combining services, which is the foundation of creating composite apps for extra value. (IBM Knowledge Center for API Connect v10.0.x).